You can translate the Enumerations similar to all the Mendix objects. I find it easy to switch the language in StudioPro using <Ctrl> + <L> keys. This makes you switch to the next language. If you do this while creating the Enumeration, you have it translated fast.
https://docs.mendix.com/refguide/enumerations-in-expressions/
getCaption retrieves the translated value
getKey retrieves the technical name for the enumeration value and is language independent
getKey($Housowner/pet) = ‘dog’ than in Dutch the getCaption($Housowner/pet)=’hond’
More shortcut keys
https://docs.mendix.com/refguide/studio-pro-overview/